package handlers

import (
	"net/http"
	"time"

	"github.com/jmoiron/sqlx"
	"workorders/internal/config"
	"workorders/internal/model"
)

type WorkOrderHandler struct {
	db  *sqlx.DB
	cfg *config.Config
}

func NewWorkOrderHandler(db *sqlx.DB, cfg *config.Config) *WorkOrderHandler {
	return &WorkOrderHandler{db: db, cfg: cfg}
}

func (h *WorkOrderHandler) List(w http.ResponseWriter, r *http.Request) {
	status := r.URL.Query().Get("status")
	search := r.URL.Query().Get("search")
	if search != "" {
		search = "%" + search + "%"
	}

	query := `
		SELECT
			wo.id, wo.wo_number, wo.title, wo.status, wo.priority,
			wo.site_name, wo.scheduled_start,
			COUNT(s.id)                   AS step_count,
			ISNULL(SUM(CAST(s.completed AS INT)),0) AS steps_done,
			COUNT(a.id)                   AS photo_count
		FROM work_orders wo
		LEFT JOIN wo_steps       s ON s.wo_id = wo.id
		LEFT JOIN wo_attachments a ON a.wo_id = wo.id
		WHERE (@p1 = '' OR wo.status = @p1)
		  AND (@p2 = '' OR wo.title LIKE @p2 OR wo.wo_number LIKE @p2 OR wo.site_name LIKE @p2)
		GROUP BY wo.id, wo.wo_number, wo.title, wo.status,
		         wo.priority, wo.site_name, wo.scheduled_start
		ORDER BY wo.scheduled_start DESC, wo.id DESC`

	rows := []model.WorkOrderListItem{}
	if err := h.db.Select(&rows, query, status, search); err != nil {
		respondError(w, http.StatusInternalServerError, err.Error())
		return
	}
	respond(w, http.StatusOK, rows)
}

func (h *WorkOrderHandler) Get(w http.ResponseWriter, r *http.Request) {
	id, err := intParam(r, "id")
	if err != nil {
		respondError(w, http.StatusBadRequest, "invalid id")
		return
	}
	var wo model.WorkOrder
	if err = h.db.Get(&wo, `SELECT * FROM work_orders WHERE id = @p1`, id); err != nil {
		respondError(w, http.StatusNotFound, "not found")
		return
	}
	respond(w, http.StatusOK, wo)
}

func (h *WorkOrderHandler) Create(w http.ResponseWriter, r *http.Request) {
	user := userFromCtx(r)
	var body model.WorkOrder
	if err := decode(r, &body); err != nil {
		respondError(w, http.StatusBadRequest, "invalid body")
		return
	}
	if body.Priority == "" {
		body.Priority = "normal"
	}

	var id int
	err := h.db.QueryRow(`
		INSERT INTO work_orders
			(title, description, instructions, status, priority,
			 scheduled_start, scheduled_end, site_name, address, lat, lng,
			 access_notes, parent_type, parent_id, created_by, updated_at)
		OUTPUT INSERTED.id
		VALUES (@p1,@p2,@p3,'draft',@p4,@p5,@p6,@p7,@p8,@p9,@p10,@p11,@p12,@p13,@p14,GETUTCDATE())`,
		body.Title, body.Description, body.Instructions, body.Priority,
		body.ScheduledStart, body.ScheduledEnd, body.SiteName, body.Address,
		body.Lat, body.Lng, body.AccessNotes, body.ParentType, body.ParentID,
		user.Email,
	).Scan(&id)
	if err != nil {
		respondError(w, http.StatusInternalServerError, err.Error())
		return
	}
	var wo model.WorkOrder
	h.db.Get(&wo, `SELECT * FROM work_orders WHERE id = @p1`, id)
	respond(w, http.StatusCreated, wo)
}

func (h *WorkOrderHandler) Update(w http.ResponseWriter, r *http.Request) {
	id, err := intParam(r, "id")
	if err != nil {
		respondError(w, http.StatusBadRequest, "invalid id")
		return
	}
	var body model.WorkOrder
	if err := decode(r, &body); err != nil {
		respondError(w, http.StatusBadRequest, "invalid body")
		return
	}
	_, err = h.db.Exec(`
		UPDATE work_orders SET
			title=@p1, description=@p2, instructions=@p3, priority=@p4,
			scheduled_start=@p5, scheduled_end=@p6, site_name=@p7, address=@p8,
			lat=@p9, lng=@p10, access_notes=@p11, updated_at=GETUTCDATE()
		WHERE id=@p12`,
		body.Title, body.Description, body.Instructions, body.Priority,
		body.ScheduledStart, body.ScheduledEnd, body.SiteName, body.Address,
		body.Lat, body.Lng, body.AccessNotes, id,
	)
	if err != nil {
		respondError(w, http.StatusInternalServerError, err.Error())
		return
	}
	var wo model.WorkOrder
	h.db.Get(&wo, `SELECT * FROM work_orders WHERE id = @p1`, id)
	respond(w, http.StatusOK, wo)
}

func (h *WorkOrderHandler) Delete(w http.ResponseWriter, r *http.Request) {
	id, err := intParam(r, "id")
	if err != nil {
		respondError(w, http.StatusBadRequest, "invalid id")
		return
	}
	h.db.Exec(`DELETE FROM work_orders WHERE id = @p1`, id)
	respond(w, http.StatusOK, map[string]any{"deleted": id})
}

func (h *WorkOrderHandler) UpdateStatus(w http.ResponseWriter, r *http.Request) {
	id, err := intParam(r, "id")
	if err != nil {
		respondError(w, http.StatusBadRequest, "invalid id")
		return
	}
	user := userFromCtx(r)
	var body struct {
		Status string `json:"status"`
	}
	if err := decode(r, &body); err != nil {
		respondError(w, http.StatusBadRequest, "invalid body")
		return
	}
	now := time.Now().UTC()
	_, err = h.db.Exec(`
		UPDATE work_orders SET
			status=@p1, updated_at=GETUTCDATE(),
			actual_start = CASE WHEN @p1='in_progress' AND actual_start IS NULL THEN @p2 ELSE actual_start END,
			actual_end   = CASE WHEN @p1='closed' THEN @p2 ELSE actual_end END,
			closed_at    = CASE WHEN @p1='closed' THEN @p2 ELSE closed_at END,
			closed_by    = CASE WHEN @p1='closed' THEN @p3 ELSE closed_by END
		WHERE id=@p4`,
		body.Status, now, user.Email, id,
	)
	if err != nil {
		respondError(w, http.StatusInternalServerError, err.Error())
		return
	}
	var wo model.WorkOrder
	h.db.Get(&wo, `SELECT * FROM work_orders WHERE id = @p1`, id)
	respond(w, http.StatusOK, wo)
}